A 13,600-year diatom oxygen isotope record from the South Carpathians (Romania): Reflection of winter conditions and possible links with North Atlantic circulation changes

Magyari, Enikő K.; Demény, Attila; Buczkó, Krisztina; Kern, Zoltán; Vennemann, Torsten; Fórizs, István; Vincze, I.; Braun, Mihály; Kovács, József; Udvardi, Beatrix; Vereș, Daniel

doi:10.1016/j.quaint.2012.05.042

Cited by 42 publications

(42 citation statements)

References 53 publications

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“…High Difflugia pulex and Trigonopyxis arcula values during D1 as indicator taxa for dry conditions (Allan et al, 2013;Charman et al, 2000) appear to confirm local drying, observed across much of the Mediterranean (Berger et al, 2016;Buczkó et al, 2013;Magyari et al, 2013; Fig. 7).…”

Section: Palaeoecological Proxy Recordmentioning

confidence: 55%

Periodic input of dust over the Eastern Carpathians during the Holocene linked with Saharan desertification and human impact

et al. 2017

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Abstract. Reconstructions of dust flux have been used to produce valuable global records of changes in atmospheric circulation and aridity. These studies have highlighted the importance of atmospheric dust in marine and terrestrial biogeochemistry and nutrient cycling. By investigating a 10 800-year-long paleoclimate archive from the Eastern Carpathians (Romania) we present the first peat record of changing dust deposition over the Holocene for the CarpathianBalkan region. Using qualitative (X-ray fluorescence (XRF) core scanning) and quantitative inductively coupled plasma optical emission spectrometer(ICP-OES) measurements of lithogenic (K, Si, Ti) elements, we identify 10 periods of major dust deposition between 9500-9200, 8400-8100, 7720-7250, 6350-5950, 5450-5050, 4130-3770, 3450-2850, 2000-1450, 800-620, and 60 cal yr BP to present. In addition, we used testate amoeba assemblages preserved within the peat to infer local palaeohydroclimatic conditions. Our record highlights several discrepancies between eastern and western European dust depositional records and the impact of highly complex hydrological regimes in the Carpathian region. Since 6100 cal yr BP, we find that the geochemical indicators of dust flux have become uncoupled from the local hydrology. This coincides with the appearance of millennial-scale cycles in the dust input and changes in geochemical composition of dust. We suggest that this is indicative of a shift in dust provenance from local-regional (likely loess-related) to distal (Saharan) sources, which coincide with the end of the African Humid Period and the onset of Saharan desertification.

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Section: Palaeoecological Proxy Recordmentioning

confidence: 55%

Periodic input of dust over the Eastern Carpathians during the Holocene linked with Saharan desertification and human impact

et al. 2017

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“…in Romania due to vapour supply by both Mediterranean and Atlantic air masses (Jancsik, 2001;Magyari et al, 2013). The climate of the Retezat is temperate continental modified by a distinct mountain mesoclimate (Spinoni et al, 2015).…”

Section: Study Sitesmentioning

confidence: 99%

Limnological changes in South Carpathian glacier-formed lakes (Retezat Mountains, Romania) during the Late Glacial and the Holocene: A synthesis

Tóth

Buczkó

Specziár

et al. 2018

Quaternary International

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Remains of aquatic biota preserved in mountain lake sediments provide an excellent tool to study lake ecosystem responses to past climate change. In the PROLONG project a multiproxy study was performed on sediments of glacier-formed lakes from the Retezat Mountains, Southern Carpathians (Romania). The studied lakes (Lake Brazi and Gales) are situated on the northern slope of the mountain at different altitudes (1740 m and 1990 m a.s.l.). Our main objectives were 1) to describe the main limnological changes in these lakes during the last ca.15,000 years and 2) to summarize the environmental history of the studied lakes based on taxonomical and functional patterns of the biological proxies. For this synthesis we used the results of diatom and chironomid analyses, and indirect biotic and abiotic parameters, including sediment organic matter (LOI) content, geochemical element concentrations (Al, Ca, S, Sr) and biogenic silica content. Using multivariate numerical approaches we analysed changes in the assemblage structure of siliceous algae and chironomids, compared temporal patterns among proxies, examined the relationship between potential driving factors, chironomid and diatom assemblage changes and identified paleolimnological phases of the lake successions. Changes in assemblage composition and aquatic ecosystem state apparently followed summer insolation, local climatic conditions and local productivity changes driven by these. Diatom and chironomid assemblages generally changed in a similar direction and at a similar time within a lake, but differed to some extent between Lake Brazi and Gales. At both lakes the strongest variations were observed in the Late Glacial and the first half of the Holocene. The strongest Holocene assemblage changes took place in the earliest Holocene in Lake Brazi, but extened into the mid-Holocene in Lake Gales, following long-term insolation changes and climatic changes. In addition, three common zone boundaries were identified: at ca. 14,200 and at ca. 6500 cal yr BP for every records and at ca. 3100 cal yr BP for diatom records in both of the lakes and for the chironomid record of Lake Brazi. This multi-proxy synthesis provides comprehensive data that increase our understanding of the past variability of lake ecosystem functioning and biodiversity in East-Central Europe.

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“…Here we describe two diatom assemblage zones (DAZ-8 and DAZ-9; Buczkó et al, 2013 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 …”

Section: Loss-on-ignition Biogenic Silica and Siliceous Algae Recordmentioning

confidence: 99%

“…Taken together, these data imply that during the 8.2 ka event winter and spring season available moisture increased, while summers were characterized by alternating moist/cool and dry/warm conditions. anomalies that has been particularly well-studied in Europe using multi-proxy analyses (Alley 54 has also been published recently from Lake Brazi (Buczkó et al, 2013). 84 In this study we aim to detect ecosystem response to the 8.2 ka climatic oscillation using loss-85 on-ignition (LOI) inferred organic content, pollen, stomata, micro-and macrocharcoal, plant 86 macrofossil, biogenic silica and diatom records.…”

mentioning

confidence: 99%

Small-scale moisture availability increase during the 8.2-ka climatic event inferred from biotic proxy records in the South Carpathians (SE Romania)

et al. 2016

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Abstract:In this paper we present high-resolution Early Holocene pollen, plant macrofossil, charcoal, diatom, biogenic silica and loss-on-ignition records from a mountain lake in the South Carpathians in order to reveal ecosystem response to the 8.2 ka climatic oscillation. We found significant changes both in terrestrial vegetation and lake diatom assemblages in the northern slope of the Retezat Mts between c. 8300 and 8000 cal yr BP. Rapid changes in relative frequencies and pollen accumulation rates of the major deciduous pollen types associated with peaks in microcharcoal accumulation rates suggested that vegetation disturbance mainly took place in the mixed-deciduous forest zone, where woodland fires partially destroyed the populations of Fraxinus excelsior, Quercus and Corylus avellana, and facilitated the establishment of Carpinus betulus in the forest openings. The diatom record furthermore showed the spread of a planktonic diatom species, Aulacoseira valida, at 8150 cal yr BP, coincidently with a short-lived expansion of C. betulus. Since diatom blooms mainly occur in spring in the Retezat Mts, increased spring waterdepth and increased water turbulence was inferred from these data.

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A 13,600-year diatom oxygen isotope record from the South Carpathians (Romania): Reflection of winter conditions and possible links with North Atlantic circulation changes

Cited by 42 publications

References 53 publications

Periodic input of dust over the Eastern Carpathians during the Holocene linked with Saharan desertification and human impact

Periodic input of dust over the Eastern Carpathians during the Holocene linked with Saharan desertification and human impact

Limnological changes in South Carpathian glacier-formed lakes (Retezat Mountains, Romania) during the Late Glacial and the Holocene: A synthesis

Small-scale moisture availability increase during the 8.2-ka climatic event inferred from biotic proxy records in the South Carpathians (SE Romania)

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